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lcd_595.h
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#include <xc.h>
#define LCD_CLEARDISPLAY 0x01
#define LCD_RETURNHOME 0x02
#define LCD_ENTRYMODESET 0x04
#define LCD_DISPLAYCONTROL 0x08
#define LCD_CURSORSHIFT 0x10
#define LCD_FUNCTIONSET 0x20
#define LCD_SETCGRAMADDR 0x40
#define LCD_SETDDRAMADDR 0x80
#define LCD_ENTRYRIGHT 0x00
#define LCD_ENTRYLEFT 0x02
#define LCD_ENTRYSHIFTINCREMENT 0x01
#define LCD_ENTRYSHIFTDECREMENT 0x00
#define LCD_DISPLAYON 0x04
#define LCD_DISPLAYOFF 0x00
#define LCD_CURSORON 0x02
#define LCD_CURSOROFF 0x00
#define LCD_BLINKON 0x01
#define LCD_BLINKOFF 0x00
#define LCD_DISPLAYMOVE 0x08
#define LCD_CURSORMOVE 0x00
#define LCD_MOVERIGHT 0x04
#define LCD_MOVELEFT 0x00
#define LCD_8BITMODE 0x10
#define LCD_4BITMODE 0x00
#define LCD_2LINE 0x08
#define LCD_1LINE 0x00
#define LCD_5x10DOTS 0x04
#define LCD_5x8DOTS 0x00
uint8_t _cols;
uint8_t _rows;
uint8_t _displayControl;
uint8_t _displayMode;
uint8_t charsize = LCD_5x8DOTS;
void SHIFT595_write(uint8_t dato)
{
for(uint8_t i=7; i<255; i--)
{
CLK_595 = 0;
LATCH_595 = 0;
NOP();
if((dato&(1<<i))==0)
DATA_595 = 0;
else
DATA_595 = 1;
NOP();
CLK_595 = 1;
NOP();
}
CLK_595 = 0;
LATCH_595 = 1;
NOP();
}
/* Envia comando por LCD ------------------------------------------*/
void LCD_595_cmd(char cmd)
{
char data_u, data_l;
data_u = (cmd&0xf0);
data_l = ((cmd<<4)&0xf0);
// SHIFT595_write(data_u|0b0010); //en=1, rs=0 1100
// SHIFT595_write(data_u|0b0000); //en=0, rs=0 1000
// SHIFT595_write(data_l|0b0010); //en=1, rs=0
// SHIFT595_write(data_l|0b0000); //en=0, rs=0
// rs = Q1 -> 0010
// en = Q3 -> 1000
SHIFT595_write(data_u|0b1000); //en=1, rs=0 1000
SHIFT595_write(data_u|0b0000); //en=0, rs=0 0000
SHIFT595_write(data_l|0b1000); //en=1, rs=0 1000
SHIFT595_write(data_l|0b0000); //en=0, rs=0 0000
__delay_ms(2);
}
/* Envia dato por LCD ------------------------------------------*/
void LCD_595_char(char data)
{
char data_u, data_l;
data_u = (data&0xf0);
data_l = ((data<<4)&0xf0);
// SHIFT595_write(data_u|0b0011); //en=1, rs=1 1101
// SHIFT595_write(data_u|0b0001); //en=0, rs=1 1001
// SHIFT595_write(data_l|0b0011); //en=1, rs=1 1101
// SHIFT595_write(data_l|0b0001); //en=0, rs=1 1001
// rs = Q1 -> 0010
// en = Q3 -> 1000
SHIFT595_write(data_u|0b1010); //en=1, rs=1 1010
SHIFT595_write(data_u|0b0010); //en=0, rs=1 0010
SHIFT595_write(data_l|0b1010); //en=1, rs=1 1010
SHIFT595_write(data_l|0b0010); //en=0, rs=1 0010
__delay_ms(2);
}
/* Inicializa LCD -----------------------------------------------*/
void LCD_595_init(uint8_t cols, uint8_t rows)
{
_cols = cols;
_rows = rows;
_displayControl = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
_displayMode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
LCD_595_cmd(0x02);
LCD_595_cmd(0x28);
LCD_595_cmd(0x0c);
LCD_595_cmd(0x80);
// LCD_595_cmd(LCD_CLEARDISPLAY);
if (_rows > 1) {
LCD_595_cmd(LCD_FUNCTIONSET | LCD_4BITMODE | LCD_2LINE | charsize);
//} else if (_rows == 1 && charsize != 0) {
// LCD_595_cmd(LCD_FUNCTIONSET | LCD_4BITMODE | LCD_1LINE | charsize);
} else {
LCD_595_cmd(LCD_FUNCTIONSET | LCD_4BITMODE | LCD_1LINE | charsize);
}
LCD_595_cmd(LCD_DISPLAYCONTROL | _displayControl);
LCD_595_cmd(LCD_CLEARDISPLAY);
//LCD_595_cmd(LCD_ENTRYMODESET | _displayMode);
}
/* Envia cadena de caracteres al LCD -----------------------------*/
void LCD_595_print(char *str)
{
while (*str) LCD_595_char(*str++);
}
void LCD_595_clear() {
LCD_595_cmd(LCD_CLEARDISPLAY);
}
void LCD_595_home() {
LCD_595_cmd(LCD_RETURNHOME);
}
void LCD_595_setCursor(uint8_t col, uint8_t row) {
uint8_t row_offsets[] = {0x00, 0x40, (0x00 | _cols), (0x40 | _cols)};
if (row > _rows) {
row = _rows - 1;
}
LCD_595_cmd(LCD_SETDDRAMADDR | (col + row_offsets[row]));
}